CODEWITHSUNDEEP
pythontensorflow
Dirk Hoekstra
Dirk Hoekstra

Reputation: 1051

Tensorflow read_file() does nothing

I am trying to read and decode an image file using Tensorflow. I have the following code:

dir_path = os.path.dirname(os.path.realpath(__file__))
filename = dir_path + '/images/cat/cat1.jpg'
image_file = tf.read_file(filename)
image_decoded = tf.image.decode_jpeg(image_file, channels=3)

print(image_file)
print(image_decoded)

This results in the following output:

Tensor("ReadFile:0", shape=(), dtype=string) Tensor("DecodeJpeg:0", shape=(?, ?, 3), dtype=uint8)

It appears as if the file is not read at all by Tensorflow. However I could not find any error messages indicating that something went wrong. I don't know how I can resolve this, any help would be greatly appreciated!

Upvotes: 4

Views: 6833

Answers (2)

Joocheol Kim
Joocheol Kim

Reputation: 134

That was one big obstacle when we first tried to use Tensorflow.

Now, Tensorflow team has made a solution.

import tensorflow as tf
tf.enable_eager_execution()

Run the above two lines at the very beginning of your program.

Then your print functions will produce something like the followings.

<tf.Tensor: id=15, shape=(), dtype=string, numpy=b'\xff\xd8\xff\xe0\x00\x10JFIF\x00\x01\x01\x00\x00\
<tf.Tensor: id=17, shape=(747, 1024, 3), dtype=uint8, numpy=
array([[[ 0,  0,  0],
        [ 0,  0,

Tensorflow team calls it eager execution. Now we don't need to run the tf.Session to see what are inside tensors.

Upvotes: 4

kvish
kvish

Reputation: 1012

Tensorflow creates a computation graph which should then be evaluated. What you see over there in the result is the op that is created. You need to define a Session object to get the results of your operations.

dir_path = os.path.dirname(os.path.realpath(__file__))
filename = dir_path + '/images/cat/cat1.jpg'
image_file = tf.read_file(filename)
image_decoded = tf.image.decode_jpeg(image_file, channels=3)
with tf.Session() as sess:
     f, img = sess.run([image_file, image_decoded])
     print(f)
     print(img)

Check out this tensorflow resource to help you further understand!

Upvotes: 5

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